* {
  margin: 0;
  padding: 0;
}
.box {
  width: 80vw;
  height: 150px;
  margin: auto;
  position: relative;
  ul {
    overflow: hidden;
    width: 100%;
    height: 100%;

    position: relative;
    li {
      position: absolute;
      top: 0;
      list-style: none;
      height: 100%;
      width: 100%;
      background: red;
      text-align: center;
      color: white;
      font-size: 50px;
      font-weight: 800;
    }
  }
  span {
    position: absolute;
    top: 60px;
    background: white;
  }
  .left {
    left: 0;
  }
  .right {
    right: 0;
  }
}
